Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of useful lives for premises and equipment

The ranges of estimated useful lives for the principal classes of assets are as follows:

Premises and Equipment	Useful Lives
Buildings	25 years
Furniture, fixtures and equipment, building improvements	3 to 7 years
Leasehold improvements	Term of lease or useful life, whichever is shorter

Schedule of new accounting pronouncements adopted and recent accounting pronouncements

New Accounting Pronouncements Adopted in 2020

Standard	Required Date of Adoption	Description	Effects on Financial Statements
Standards Adopted in 2020
ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and subsequent related ASUs	January 1, 2020 Early adoption is permitted on January 1, 2019.	The ASU introduces a new CECL model that applies to most financial assets measured at amortized cost and certain instruments, including trade and other receivables, loan receivables, AFS and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also eliminates the guidance for PCI loans, but requires an allowance for loan losses for purchased financial assets with more than an insignificant deterioration of credit since origination. The ASU also modifies the OTTI model for AFS debt securities to require an allowance for credit losses instead of a direct write-down. A reversal of the allowance for credit losses is allowed in future periods based on improvements in credit performance expectations. This ASU expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan and lease losses, and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. The new guidance also allows optional relief for certain instruments measured at amortized cost with an option to irrevocably elect the fair value option under ASC Topic 825, Financial Instruments.	The Company adopted ASU 2016-13 using a modified retrospective approach on January 1, 2020 without electing the fair value option on eligible financial instruments under ASU 2019-05. The adoption of this ASU increased the allowance for loan losses by $125.2 million, and allowance for unfunded credit commitments by $10.5 million and an after-tax decrease to opening retained earnings of $98.0 million on January 1, 2020. The increase to allowance for loan losses was primarily related to the C&I and CRE loan portfolios. The Company did not record an allowance for credit losses related to the Company’s AFS debt securities as a result of this adoption. Disclosures for periods after January 1, 2020 are presented in accordance with ASC 326 while prior period amounts continue to be reported in accordance with the incurred-loss methodology before CECL adoption. The Company has elected the CECL phase-in option provided by regulatory capital rules, which delays the impact of CECL on regulatory capital for two years, followed by a three-year transition period. As a result, the effects of CECL on the Company’s and the Bank’s regulatory capital will be delayed through the year 2021, after which the effects will be phased-in over a three-year period from January 1, 2022 through December 31, 2024.
ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment	January 1, 2020 Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017.	The ASU simplifies the accounting for goodwill impairment. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value and the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. This guidance should be applied prospectively.	The Company adopted this guidance on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
ASU 2018-15, Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract	January 1, 2020	The ASU amends ASC Topic 350-40 to align the accounting for costs incurred in a cloud computing arrangement with the guidance on developing internal use software. Specifically, if a cloud computing arrangement is deemed to be a service contract, certain implementation costs are eligible for capitalization. The new guidance prescribes the balance sheet and income statement presentation and cash flow classification for the capitalized costs and related amortization expense. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption.	The Company adopted this guidance on a prospective basis on January 1, 2020. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.

Recent Accounting Pronouncement

Standard	Required Date of Adoption	Description	Effect on Financial Statements
Standard Not Yet Adopted
ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting	Effective for all entities as of March 12, 2020 through December 31, 2022.	In March 2020, the FASB issued an accounting standard related to contracts or hedging relationships that reference London interbank offered rate or other reference rates that are expected to be discontinued due to reference rate reform. This ASU provides temporary optional expedients and exceptions regarding the accounting requirements related to the modification of certain contracts, hedging relationships and other transactions that are affected by the reference rate reform. The guidance permits the Company to make a one-time election to sell and/or transfer qualifying held-to-maturity securities, and not to apply modification accounting or remeasure lease payments in lease contracts if the changes to the contract are related to the discontinuation of the reference rate. If certain criteria are met, the amendments also allow exceptions to the de-designation criteria of the hedging relationship and the assessment of hedge effectiveness during the transition period. This one time election may be made at any time after March 12, 2020, but no later than December 31, 2022.	The Company adopted this guidance on a prospective basis in January 2021. At the time of adoption, the guidance did not have a material impact on the Company’s Consolidated Financial Statements. The Company will continue to track the exposure as of each reporting period and to assess the impact as the reference rate transition occurs through the cessation of LIBOR.
ASU 2021-01, Reference Rate Reform (Topic 848): Scope	Effective immediately as of January 7, 2021 through December 31, 2022 for all entities.	In January 2021, the FASB issued ASU 2021-01, which expanded the scope of Topic 848 to include all affected derivatives and give market participants the ability to apply certain aspects of the contract modification and hedge accounting expedients to derivative contracts affected by the discounting transition. The amendments of this guidance may be elected retrospectively as of any date from the beginning of the interim period that includes March 12, 2020, or prospectively to new modifications made on or after any date that includes January 7, 2021.	The Company adopted this guidance on a prospective basis in January 2021. At the time of adoption, the guidance did not have a material impact on the Company’s Consolidated Financial Statements.